Preparation method and application of highly-wrinkled graphene oxide film
A graphene film, graphene technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of non-linear response, long response time, etc., to achieve improved sensitivity, increased detection area, and easy penetration. Effect
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Embodiment 1
[0027] (1) a graphene oxide solution with a concentration of 1g / L is suction-filtered to form a film, and the thickness of the film is 100nm;
[0028] (2) Drop a drop of distilled water on the electrode, and then suspend the graphene oxide film obtained in step 1 on the water drop.
[0029] (3) Evaporate at 80°C to obtain figure 1 The wrinkled graphene oxide membrane shown. It can be seen from the figure that the surface has uniformly distributed wrinkles, and the surface wrinkles are measured by atomic force microscopy, and the average height of the wrinkles is about 60nm (such as figure 2 shown).
[0030] According to the method of this embodiment, the obtained highly wrinkled graphene oxide film is linear to the resonance signal of humidity, such as image 3 As shown in a; the sensitivity is also linear, such as image 3 As shown in b, it can be seen from the figure that compared with the prior art, the increase is about 2 times. In addition, experiments have proved t...
Embodiment 2
[0032] (1) Configure a graphene oxide DMF solution with a concentration of 1g / L, and precipitate graphene oxide sheets with ethyl acetate, and finally filter to form a film with a thickness of 100nm;
[0033] (2) Drop a drop of distilled water on the electrode, and then suspend the graphene oxide film obtained in step 1 on the water drop.
[0034] (3) Evaporate at 80° C. to obtain a wrinkled graphene oxide film similar to Example 1.
[0035] The graphene oxide film prepared in this embodiment is further enlarged and characterized, such as Figure 4 It can be seen from the figure that through heterogeneous film formation, the graphene oxide sheets themselves are wrinkled and stacked.
[0036] According to the method of this embodiment, the obtained highly wrinkled graphene oxide film is linear to the resonance signal of humidity, and the sensitivity increases with the increase of humidity, which is 4 times higher than that of the prior art. Compared with embodiment 1, there i...
Embodiment 3
[0038] In this embodiment, an ultra-thin self-supporting graphene oxide film with a wrinkled structure is prepared by the solid transfer method, as follows:
[0039] (1) Prepare a graphene oxide solution with a concentration of 0.1 g / L, and use AAO to filter to form a film with a thickness of 10 nm.
[0040] (2) Apply the melted solid transfer agent camphor evenly on the surface of the reduced graphene oxide film by evaporation, and cool it naturally at room temperature until the basement film falls off naturally.
[0041] (3) volatilize the solid transfer agent by the graphene oxide film supported by the solid transfer agent camphor obtained above at a temperature of 120° C. to volatilize the solid transfer agent to obtain an independent self-supporting graphene oxide film, such as Figure 5 shown. The thickness is about 10nm and can be self-supporting.
[0042] (4) Drop a drop of distilled water on the electrode, and then suspend the graphene oxide film obtained in step 3 ...
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Abstract
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